title: Magnetic Resonance Imaging Duodenoscope.
abstract: A side-viewing duodenoscope capable of both optical and magnetic resonance imaging (MRI) is described. The instrument is constructed from MR-compatible materials and combines a coherent fiber bundle for optical imaging, an irrigation channel and a side-opening biopsy channel for the passage of catheter tools with a tip saddle coil for radio-frequency signal reception. The receiver coil is magnetically coupled to an internal pickup coil to provide intrinsic safety. Impedance matching is achieved using a mechanically variable mutual inductance, and active decoupling by PIN-diode switching. (1)H MRI of phantoms and ex vivo porcine liver specimens was carried out at 1.5 T. An MRI field-of-view appropriate for use during endoscopic retrograde cholangiopancreatography (ERCP) was obtained, with limited artefacts, and a signal-to-noise ratio advantage over a surface array coil was demonstrated.
authors.forename: Richard R A
authors.initials: RR
authors.lastname: Syms
authors.forename: Ian R
authors.initials: IR
authors.lastname: Young
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Wadsworth
authors.forename: Simon D
authors.initials: SD
authors.lastname: Taylor-Robinson
authors.forename: Marc
authors.initials: M
authors.lastname: Rea
mesh_terms: D000818:Animals; D002760:Cholangiopancreatography, Endoscopic Retrograde / Q000295:instrumentation; D020698:Duodenoscopes; D004867:Equipment Design; D008099:Liver / Q000601:surgery; D008279:Magnetic Resonance Imaging / Q000295:instrumentation* / Q000379:methods*; D019047:Phantoms, Imaging; D059629:Signal-To-Noise Ratio; D013552:Swine